Data Appendix for
"Who Values Future Energy Savings? Evidence from American Drivers"
created on 12 September 2022

Arik Levinson, 	Georgetown University & NBER	(arik.levinson@georgetown.edu)
Lutz Sager, 	Georgetown University 		(lutz.sager@georgetown.edu)


This data appendix contains the final data samples and code to generate the figures and table in the published manuscript. All output can be generated by running the OUTPUT.do file in Stata. The data is split into two samples: 
1) VEH1.dta contains the hybrid-gas vehicle pairs and is used to generate the output in Section III.
2) VEH2.dta contains all vehicles and is used to generate the output in Section IV of the paper.

OUTPUT.do fully reproduces the following figures and tables:
- Figure 1
- Figure 3
- Figure 4
- Figure 5
- Figure 6
- Figure 7
- Table 1
- Table 2
- Table 4
- Table 6b

The following output only replicate in part due to the data use restrictions:
- Tables 3/5: The vehicle characteristics from Ward's are copyrighted and redistribution is prohibited. That is why all original variables containing vehicle characteristics from WardsAutomotive had to be omitted from the data archive. We nevertheless include the relevant code, which fully reproduces Tables 3 and 5 after researchers have (1) acquired access to WardsAutomotive data and (2) merged in vehicle characteristics based on Make/Model/Year. The VEH1.dta and VEH2.dta files already contain the relevant concordance variables called maketextWards modltextWards vehyear.
- Table 6a: The time-of-purchase analysis in panel (a) of Table 6 is based on the Maritz CX New Vehicle Customer Study produced by MaritzCX Research LLC and maintained on a secure network by Resource for the Future, Inc (RFF). Researchers interested in replicating these results can do so by acquiring access rights to the relevant data (through contacting RFF and/or MaritzCX).

The final data samples VEH1.dta and VEH2.dta were assembled using the following procedure:
1) The baseline data are from the combined NHTS 2009 and NHTS 2017 vehicles files (https://nhts.ornl.gov/)
2) Merge in household, driver and trip data from NHTS 2009 and NHTS 2017 surveys (merged based on housed and/or personal)
3) Merge in the vehicle prices and characteristics from WARD's 2005-17 Model U.S. Car and Light Truck Specifications and Prices (Copyright, Ward's Automotive Group, a division of Penton Media Inc.) [merged based on maketextWards modltextWards vehyear HybridVehicle]
3) Merge in annual average retail fuel prices from EIA (https://www.eia.gov/dnav/pet/pet_pri_gnd_a_epm0u_pte_dpgal_a.htm), [merged based on PADD regio]
4) Restrict sample as follows:
The two waves of the NHTS have data on 294,409 households that own 776,731 cars and light trucks (pickup trucks, SUVs/CUVs and vans). We restrict our sample to those households for which we have information on miles driven and a complete set of covariates (income, age of household head, education, rural or urban). We limit the sample to those vehicles that we successfully matched (by make, model, and year of production) to engineering characteristics (mpg, length, width, height, weight, liters, valves, horsepower, and revolutions per minute, rpm) from WardsAuto. When a model-year has multiple trims, we assign the characteristics of the cheapest. This final sample contains 155,572 household-vehicle observations. A subsample of 24,362 comprises vehicle models that come with either a gas-powered or a hybrid engine, and for which both are present in the sample.
